There are detailed instructions on Stringify's forums written by Dave Evans.
However, their forums are going away in a couple days, so I'm cutting and pasting the relevant bits below:
-
Unplug the GD00Z-4.
-
Locate the wall button and remove it. If you have more than one, be sure to use the correct one.
- Once removed, turn it over, and you'll notice that it contains a small circuit board. (We will be soldering our GD00Z-4 wires to this board.)
- Unscrew the two screws (in this case labeled Red and White) that connect the wires to your garage door opener.
Carefully remove the circuit board from the plastic housing, turn it over and note the small push button switch, in this case, labelled SW1 . (We'll be soldering the GD00Z-4 wires to two legs of this switch.)
- Solder the wires from the GD00Z-4 to the two legs on the switch as shown:
Note: You can use a multimeter to test the resistance of the two legs when the button is pressed to confirm the correct legs. (resistance should be 0 ohms when the button is pressed).
- Reassemble everything.
